They will not grow up being compared, but...

Some differences we've noticed between Evan and Maya:

Evan made his first cry 30 seconds after he was born
Maya cried immediately after she was born

Evan didn't nap during the day
Maya has 2-3 good naps each day

Evan slept through the night at this age
Maya is up every 3-4 hours

Evan hated the swing but loved the bouncy chair
Maya loves the swing and hates the bouncy chair

Evan never knew his mobile existed
Maya is entertained by the mobile

Evan hated the bumbo
Maya will happily sit in her bumbo for several minutes.

I could not put Evan down or leave his sight
Maya is usually easy about being put down while I go do something

Evan would fall asleep to the sound of a heartbeat
Maya falls asleep to the sound of rain

Evan never needed to be burped after eating and seldom spit up
Maya always needs to be burped after eating and spits up daily

Evan would fall asleep while nursing and keeping him awake was a real challenge
Maya seldom falls asleep while nursing

Evan didn't take a soother till he was 6+ months
Maya took a soother her first week (we worked on that one though)

It's just fun to remember Evan at this age and see the drastic differences.